Ok I've followed your suggestions and this is the best I've been able to do:
Isn't "port:port" a range?
I thought the same thing but in practice it doesn't work: I tried with 1:65535, 1::65535, 1-65535, but they are not accepted. Une single value instead works.
I've discovered that if I don't select the protocol, it seems to consider ALL protocols. At the same time, when no protocol is selected, the textbox of the port is disabled. In the screenshot you can see that in the port columns there is this character "-". What would it mean? Any port or no port at all? Is there any way to test if the filters that I've set are working correctly?